Thallid

The patriarch of the Fungus tribe, and the card that defined how the whole subtheme would generate value forever after. The design idea is patience as a resource: instead of paying mana for a token, you pay turns, accumulating a spore counter each upkeep and cashing in three of them for a Saproling. That clock is the entire balance. A 1/1 for one mana that takes four full turns to produce its first body is glacial by any rate measure, but the engine never stops and never costs a card, and the Saprolings it makes are the fuel that later Fungus designs learned to convert into damage, sacrifice triggers, or +1/+1 counters. Everything in the tribe traces back to this template: the spore counter as a built-in egg timer, the Saproling as the yield. Later iterations sped the clock or sweetened the payoff (Thelon of Havenwood, Sporoloth Ancient, Slimefoot variants), but the structural relationship between counters accruing on the producer and tokens spun off on demand was set here. What makes the card worth studying is how cleanly it isolates a single design lever: the rate is deliberately bad so the engine can be open-ended, and the entire Fungus-and-Saproling lineage is just successive attempts to tune that one lever without breaking it.